Security readout for executives and security teams
Plain-English summary
CVE-2026-2919 is a Mozilla Focus for iOS address-bar spoofing issue. A malicious page could make attacker-controlled content appear under a trusted domain in the browser UI. This can support phishing or deception, but sources rate it medium severity and do not indicate active exploitation.
Executive priority
Treat as a moderate phishing-enablement issue. It should be remediated through normal mobile browser update processes, with higher priority for users handling sensitive accounts or credentials in Focus for iOS.
Technical view
Mozilla describes a CWE-451 UI misrepresentation flaw in Focus for iOS. Malicious scripts could cause attacker content to display while the UI shows a spoofed trusted domain, using a stalled navigation and iframe redirect condition. CVSS is 4.3: network-reachable, low complexity, no privileges, user interaction required, low integrity impact.
Likely exposure
Exposure is limited to Mozilla Focus for iOS users on versions vulnerable before the fix. The provided data says the issue was fixed in Focus for iOS 148.2, but does not provide a complete affected-version range.
Exploitation context
Successful exploitation requires a user to interact with or visit malicious web content in Focus for iOS. The likely impact is deceptive presentation of a trusted domain, useful for phishing. The bundle indicates this is not in CISA KEV, and no cited source claims active exploitation.
Researcher notes
The source bundle gives the fix version but not a precise vulnerable-version range. Analysis should avoid assuming broader Mozilla products are affected. Validation should focus on Focus for iOS version state and advisory monitoring, not exploit reproduction.
Mitigation direction
- Update Mozilla Focus for iOS to version 148.2 or later if available.
- Prioritize managed iOS devices where Focus is installed.
- Warn users not to trust page identity based only on visible browser UI.
- Monitor Mozilla’s advisory for any corrected affected-version details.
Validation and detection
- Inventory iOS devices for Mozilla Focus installations.
- Confirm installed Focus versions are 148.2 or later.
- Review mobile device management data for lagging app updates.
- Check Mozilla advisory and CVE record for updates.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-451: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-2919 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.mozilla.org/show_bug.cgi?id=1975842CVE reference
- https://www.mozilla.org/security/advisories/mfsa2026-18/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
User Interface (UI) Misrepresentation of Critical Information
User Interface (UI) Misrepresentation of Critical Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.